Add server settings and operator guide

Server-and-Operator-Guide.md

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+# Server and Operator Guide
+
+Run the same required gameplay mods on server and clients: Rivencraft, Dynamic Dimensions AR Edition, and Bad Packets. See [Installation](Installation) for versions and optional integrations. Stop the server before making a **complete world-folder backup**; copying only a dimension folder is not enough to restore an Age and its books.
+
+## Useful settings
+
+- descriptive_books.return_link_mode: DISABLED (default), ON_CREATION, or ALWAYS.
+- libraries.loot_mode: LEGACY or AGE_ONLY (Pages describing the containing Age).
+- serene_seasons.auto_whitelist_ages: automatically enroll eligible Ages when the optional season mod is installed.
+- Client-side book_preview.mode: AUTO, IMMERSIVE_PORTALS, PONDER, or LEGACY.
+
+The server also has writing-ink and instability settings. Review the generated NeoForge config and make a backup before changing a live world. Client preview settings do not change server-side Age generation or travel rules.
+
+## Operator commands
+
+- /rivencraft age list shows registered Ages and whether each runtime dimension is loaded.
+- /rivencraft age unload <dimension> unloads an Age while retaining its definition and world data. Opening its Descriptive Book can load it again.
+- /rivencraft library nearest looks for a generated Age library and teleports the operator to a suitable one if found. It may generate candidate chunks while searching.
+- /rivencraft binder messages enable and /rivencraft binder messages disable control detailed Binder diagnostics. Only OPs see these messages when enabled.
+
+The creative-only **Link Modifier** can change link properties and deliberately retire an unoccupied Age. Retirement marks its UUID dead and archives its data in a sibling retired-Ages folder. It is not routine maintenance; back up the entire world first. See [Age administration and recovery](https://git.paddedcell.org/dnorberg/rivencraft/src/branch/main/docs/AGES.md).
+
+Library testing commands exist for development, including /rivencraft library test-place and test-spacing. They can place structures or generate extra candidate chunks; do not use them as ordinary gameplay commands. The [library audit](https://git.paddedcell.org/dnorberg/rivencraft/src/branch/main/docs/LEGACY_M7_AUDIT.md) documents their behavior.
+
+When reporting a server issue, include the Rivencraft, Minecraft, NeoForge, and required-mod versions; whether optional mods are present; reproduction steps; and a relevant log excerpt. Remove account tokens, private server addresses, and personal information before attaching logs. [File an issue](https://git.paddedcell.org/dnorberg/rivencraft/issues).